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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [m68k/] [mm/] [memory.c] - Blame information for rev 1782

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/*
 *  linux/arch/m68k/mm/memory.c
 *
 *  Copyright (C) 1995  Hamish Macdonald
 */
 
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/malloc.h>
 
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/traps.h>
#include <asm/amigahw.h>
#include <asm/bootinfo.h>
 
extern pte_t *kernel_page_table (unsigned long *memavailp);
 
/* Strings for `extern inline' functions in <asm/pgtable.h>.  If put
   directly into these functions, they are output for every file that
   includes pgtable.h */
 
const char PgtabStr_bad_pmd[] = "Bad pmd in pte_alloc: %08lx\n";
const char PgtabStr_bad_pgd[] = "Bad pgd in pmd_alloc: %08lx\n";
const char PgtabStr_bad_pmdk[] = "Bad pmd in pte_alloc_kernel: %08lx\n";
const char PgtabStr_bad_pgdk[] = "Bad pgd in pmd_alloc_kernel: %08lx\n";
 
static struct ptable_desc {
        struct ptable_desc *prev;
        struct ptable_desc *next;
        unsigned long      page;
        unsigned char      alloced;
} ptable_list = { &ptable_list, &ptable_list, 0, 0xff };
 
#define PD_NONEFREE(dp) ((dp)->alloced == 0xff)
#define PD_ALLFREE(dp) ((dp)->alloced == 0)
#define PD_TABLEFREE(dp,i) (!((dp)->alloced & (1<<(i))))
#define PD_MARKUSED(dp,i) ((dp)->alloced |= (1<<(i)))
#define PD_MARKFREE(dp,i) ((dp)->alloced &= ~(1<<(i)))
 
#define PTABLE_SIZE (PTRS_PER_PMD * sizeof(pmd_t))
 
pmd_t *get_pointer_table (void)
{
        pmd_t *pmdp = NULL;
        unsigned long flags;
        struct ptable_desc *dp = ptable_list.next;
        int i;
 
        /*
         * For a pointer table for a user process address space, a
         * table is taken from a page allocated for the purpose.  Each
         * page can hold 8 pointer tables.  The page is remapped in
         * virtual address space to be noncacheable.
         */
        if (PD_NONEFREE (dp)) {
 
                if (!(dp = kmalloc (sizeof(struct ptable_desc),GFP_KERNEL))) {
                        return 0;
                }
 
                if (!(dp->page = __get_free_page (GFP_KERNEL))) {
                        kfree (dp);
                        return 0;
                }
 
                nocache_page (dp->page);
 
                dp->alloced = 0;
                /* put at head of list */
                save_flags(flags);
                cli();
                dp->next = ptable_list.next;
                dp->prev = ptable_list.next->prev;
                ptable_list.next->prev = dp;
                ptable_list.next = dp;
                restore_flags(flags);
        }
 
        for (i = 0; i < 8; i++)
                if (PD_TABLEFREE (dp, i)) {
                        PD_MARKUSED (dp, i);
                        pmdp = (pmd_t *)(dp->page + PTABLE_SIZE*i);
                        break;
                }
 
        if (PD_NONEFREE (dp)) {
                /* move to end of list */
                save_flags(flags);
                cli();
                dp->prev->next = dp->next;
                dp->next->prev = dp->prev;
 
                dp->next = ptable_list.next->prev;
                dp->prev = ptable_list.prev;
                ptable_list.prev->next = dp;
                ptable_list.prev = dp;
                restore_flags(flags);
        }
 
        memset (pmdp, 0, PTABLE_SIZE);
 
        return pmdp;
}
 
void free_pointer_table (pmd_t *ptable)
{
        struct ptable_desc *dp;
        unsigned long page = (unsigned long)ptable & PAGE_MASK;
        int index = ((unsigned long)ptable - page)/PTABLE_SIZE;
        unsigned long flags;
 
        for (dp = ptable_list.next; dp->page && dp->page != page; dp = dp->next)
                ;
 
        if (!dp->page)
                panic ("unable to find desc for ptable %p on list!", ptable);
 
        if (PD_TABLEFREE (dp, index))
                panic ("table already free!");
 
        PD_MARKFREE (dp, index);
 
        if (PD_ALLFREE (dp)) {
                /* all tables in page are free, free page */
                save_flags(flags);
                cli();
                dp->prev->next = dp->next;
                dp->next->prev = dp->prev;
                restore_flags(flags);
                cache_page (dp->page);
                free_page (dp->page);
                kfree (dp);
                return;
        } else {
                /*
                 * move this descriptor to the front of the list, since
                 * it has one or more free tables.
                 */
                save_flags(flags);
                cli();
                dp->prev->next = dp->next;
                dp->next->prev = dp->prev;
 
                dp->next = ptable_list.next;
                dp->prev = ptable_list.next->prev;
                ptable_list.next->prev = dp;
                ptable_list.next = dp;
                restore_flags(flags);
        }
}
 
/* maximum pages used for kpointer tables */
#define KPTR_PAGES      4
/* # of reserved slots */
#define RESERVED_KPTR   4
extern pmd_tablepage kernel_pmd_table; /* reserved in head.S */
 
static struct kpointer_pages {
        pmd_tablepage *page[KPTR_PAGES];
        u_char alloced[KPTR_PAGES];
} kptr_pages;
 
void init_kpointer_table(void) {
        short i = KPTR_PAGES-1;
 
        /* first page is reserved in head.S */
        kptr_pages.page[i] = &kernel_pmd_table;
        kptr_pages.alloced[i] = ~(0xff>>RESERVED_KPTR);
        for (i--; i>=0; i--) {
                kptr_pages.page[i] = NULL;
                kptr_pages.alloced[i] = 0;
        }
}
 
pmd_t *get_kpointer_table (void)
{
        /* For pointer tables for the kernel virtual address space,
         * use the page that is reserved in head.S that can hold up to
         * 8 pointer tables. 3 of these tables are always reserved
         * (kernel_pg_dir, swapper_pg_dir and kernel pointer table for
         * the first 16 MB of RAM). In addition, the 4th pointer table
         * in this page is reserved. On Amiga and Atari, it is used to
         * map in the hardware registers. It may be used for other
         * purposes on other 68k machines. This leaves 4 pointer tables
         * available for use by the kernel. 1 of them are usually used
         * for the vmalloc tables. This allows mapping of 3 * 32 = 96 MB
         * of physical memory. But these pointer tables are also used
         * for other purposes, like kernel_map(), so further pages can
         * now be allocated.
         */
        pmd_tablepage *page;
        pmd_table *table;
        long nr, offset = -8;
        short i;
 
        for (i=KPTR_PAGES-1; i>=0; i--) {
                asm volatile("bfffo %1{%2,#8},%0"
                        : "=d" (nr)
                        : "d" ((u_char)~kptr_pages.alloced[i]), "d" (offset));
                if (nr)
                        break;
        }
        if (i < 0) {
                printk("No space for kernel pointer table!\n");
                return NULL;
        }
        if (!(page = kptr_pages.page[i])) {
                if (!(page = (pmd_tablepage *)__get_free_page(GFP_KERNEL))) {
                        printk("No space for kernel pointer table!\n");
                        return NULL;
                }
                nocache_page((u_long)(kptr_pages.page[i] = page));
        }
        asm volatile("bfset %0@{%1,#1}"
                : /* no output */
                : "a" (&kptr_pages.alloced[i]), "d" (nr-offset));
        table = &(*page)[nr-offset];
        memset(table, 0, sizeof(pmd_table));
        return ((pmd_t *)table);
}
 
void free_kpointer_table (pmd_t *pmdp)
{
        pmd_table *table = (pmd_table *)pmdp;
        pmd_tablepage *page = (pmd_tablepage *)((u_long)table & PAGE_MASK);
        long nr;
        short i;
 
        for (i=KPTR_PAGES-1; i>=0; i--) {
                if (kptr_pages.page[i] == page)
                        break;
        }
        nr = ((u_long)table - (u_long)page) / sizeof(pmd_table);
        if (!table || i < 0 || (i == KPTR_PAGES-1 && nr < RESERVED_KPTR)) {
                printk("Attempt to free invalid kernel pointer table: %p\n", table);
                return;
        }
        asm volatile("bfclr %0@{%1,#1}"
                : /* no output */
                : "a" (&kptr_pages.alloced[i]), "d" (nr));
        if (!kptr_pages.alloced[i]) {
                kptr_pages.page[i] = 0;
                cache_page ((u_long)page);
                free_page ((u_long)page);
        }
}
 
/*
 * The following two routines map from a physical address to a kernel
 * virtual address and vice versa.
 */
unsigned long mm_vtop (unsigned long vaddr)
{
        int i;
        unsigned long voff = vaddr;
        unsigned long offset = 0;
 
        for (i = 0; i < boot_info.num_memory; i++)
        {
                if (voff < offset + boot_info.memory[i].size) {
#ifdef DEBUGPV
                        printk ("VTOP(%lx)=%lx\n", vaddr,
                                boot_info.memory[i].addr + voff - offset);
#endif
                        return boot_info.memory[i].addr + voff - offset;
                } else
                        offset += boot_info.memory[i].size;
        }
 
        /* not in one of the memory chunks; get the actual
         * physical address from the MMU.
         */
        if (m68k_is040or060 == 6) {
          unsigned long fs = get_fs();
          unsigned long  paddr;
 
          set_fs (SUPER_DATA);
 
          /* The PLPAR instruction causes an access error if the translation
           * is not possible. We don't catch that here, so a bad kernel trap
           * will be reported in this case. */
          asm volatile ("movel %1,%/a0\n\t"
                        ".word 0xf5c8\n\t"      /* plpar (a0) */
                        "movel %/a0,%0"
                        : "=g" (paddr)
                        : "g" (vaddr)
                        : "a0" );
          set_fs (fs);
 
          return paddr;
 
        } else if (m68k_is040or060 == 4) {
          unsigned long mmusr;
          unsigned long fs = get_fs();
 
          set_fs (SUPER_DATA);
 
          asm volatile ("movel %1,%/a0\n\t"
                        ".word 0xf568\n\t"      /* ptestr (a0) */
                        ".long 0x4e7a8805\n\t"  /* movec mmusr, a0 */
                        "movel %/a0,%0"
                        : "=g" (mmusr)
                        : "g" (vaddr)
                        : "a0", "d0");
          set_fs (fs);
 
          if (mmusr & MMU_R_040)
            return (mmusr & PAGE_MASK) | (vaddr & (PAGE_SIZE-1));
 
          panic ("VTOP040: bad virtual address %08lx (%lx)", vaddr, mmusr);
        } else {
          volatile unsigned short temp;
          unsigned short mmusr;
          unsigned long *descaddr;
 
          asm volatile ("ptestr #5,%2@,#7,%0\n\t"
                        "pmove %/psr,%1@"
                        : "=a&" (descaddr)
                        : "a" (&temp), "a" (vaddr));
          mmusr = temp;
 
          if (mmusr & (MMU_I|MMU_B|MMU_L))
            panic ("VTOP030: bad virtual address %08lx (%x)", vaddr, mmusr);
 
          descaddr = (unsigned long *)PTOV(descaddr);
 
          switch (mmusr & MMU_NUM) {
          case 1:
            return (*descaddr & 0xfe000000) | (vaddr & 0x01ffffff);
          case 2:
            return (*descaddr & 0xfffc0000) | (vaddr & 0x0003ffff);
          case 3:
            return (*descaddr & PAGE_MASK) | (vaddr & (PAGE_SIZE-1));
          default:
            panic ("VTOP: bad levels (%u) for virtual address %08lx",
                   mmusr & MMU_NUM, vaddr);
          }
        }
 
        panic ("VTOP: bad virtual address %08lx", vaddr);
}
 
unsigned long mm_ptov (unsigned long paddr)
{
        int i;
        unsigned long offset = 0;
 
        for (i = 0; i < boot_info.num_memory; i++)
        {
                if (paddr >= boot_info.memory[i].addr &&
                    paddr < (boot_info.memory[i].addr
                             + boot_info.memory[i].size)) {
#ifdef DEBUGPV
                        printk ("PTOV(%lx)=%lx\n", paddr,
                                (paddr - boot_info.memory[i].addr) + offset);
#endif
                        return (paddr - boot_info.memory[i].addr) + offset;
                } else
                        offset += boot_info.memory[i].size;
        }
 
        /*
         * assume that the kernel virtual address is the same as the
         * physical address.
         *
         * This should be reasonable in most situations:
         *  1) They shouldn't be dereferencing the virtual address
         *     unless they are sure that it is valid from kernel space.
         *  2) The only usage I see so far is converting a page table
         *     reference to some non-FASTMEM address space when freeing
         *     mmaped "/dev/mem" pages.  These addresses are just passed
         *     to "free_page", which ignores addresses that aren't in
         *     the memory list anyway.
         *
         */
 
        /*
         * if on an amiga and address is in first 16M, move it
         * to the ZTWO_ADDR range
         */
        if (MACH_IS_AMIGA && paddr < 16*1024*1024)
                return ZTWO_VADDR(paddr);
        return paddr;
}
 
/* invalidate page in both caches */
#define clear040(paddr) __asm__ __volatile__ ("movel %0,%/a0\n\t"\
                                              "nop\n\t"\
                                              ".word 0xf4d0"\
                                              /* CINVP I/D (a0) */\
                                              : : "g" ((paddr))\
                                              : "a0")
 
/* invalidate page in i-cache */
#define cleari040(paddr) __asm__ __volatile__ ("movel %0,%/a0\n\t"\
                                               /* CINVP I (a0) */\
                                               "nop\n\t"\
                                               ".word 0xf490"\
                                               : : "g" ((paddr))\
                                               : "a0")
 
/* push page in both caches */
#define push040(paddr) __asm__ __volatile__ ("movel %0,%/a0\n\t"\
                                              "nop\n\t"\
                                             ".word 0xf4f0"\
                                             /* CPUSHP I/D (a0) */\
                                             : : "g" ((paddr))\
                                             : "a0")
 
/* push and invalidate page in both caches */
#define pushcl040(paddr) do { push040((paddr));\
                              if (m68k_is040or060 == 6) clear040((paddr));\
                         } while(0)
 
/* push page in both caches, invalidate in i-cache */
#define pushcli040(paddr) do { push040((paddr));\
                               if (m68k_is040or060 == 6) cleari040((paddr));\
                          } while(0)
 
/* push page defined by virtual address in both caches */
#define pushv040(vaddr) __asm__ __volatile__ ("movel %0,%/a0\n\t"\
                                              /* ptestr (a0) */\
                                              ".word 0xf568\n\t"\
                                              /* movec mmusr,d0 */\
                                              ".long 0x4e7a0805\n\t"\
                                              "andw #0xf000,%/d0\n\t"\
                                              "movel %/d0,%/a0\n\t"\
                                              /* CPUSHP I/D (a0) */\
                                              "nop\n\t"\
                                              ".word 0xf4f0"\
                                              : : "g" ((vaddr))\
                                              : "a0", "d0")
 
/* push page defined by virtual address in both caches */
#define pushv060(vaddr) __asm__ __volatile__ ("movel %0,%/a0\n\t"\
                                              /* plpar (a0) */\
                                              ".word 0xf5c8\n\t"\
                                              /* CPUSHP I/D (a0) */\
                                              ".word 0xf4f0"\
                                              : : "g" ((vaddr))\
                                              : "a0")
 
 
/*
 * 040: Hit every page containing an address in the range paddr..paddr+len-1.
 * (Low order bits of the ea of a CINVP/CPUSHP are "don't care"s).
 * Hit every page until there is a page or less to go. Hit the next page,
 * and the one after that if the range hits it.
 */
/* ++roman: A little bit more care is required here: The CINVP instruction
 * invalidates cache entries WITHOUT WRITING DIRTY DATA BACK! So the beginning
 * and the end of the region must be treated differently if they are not
 * exactly at the beginning or end of a page boundary. Else, maybe too much
 * data becomes invalidated and thus lost forever. CPUSHP does what we need:
 * it invalidates the page after pushing dirty data to memory. (Thanks to Jes
 * for discovering the problem!)
 */
/* ... but on the '060, CPUSH doesn't invalidate (for us, since we have set
 * the DPI bit in the CACR; would it cause problems with temporarily changing
 * this?). So we have to push first and then additionally to invalidate.
 */
 
/*
 * cache_clear() semantics: Clear any cache entries for the area in question,
 * without writing back dirty entries first. This is useful if the data will
 * be overwritten anyway, e.g. by DMA to memory. The range is defined by a
 * _physical_ address.
 */
 
void cache_clear (unsigned long paddr, int len)
{
    if (m68k_is040or060) {
        /* ++roman: There have been too many problems with the CINV, it seems
         * to break the cache maintenance of DMAing drivers. I don't expect
         * too much overhead by using CPUSH instead.
         */
        while (len > PAGE_SIZE) {
            pushcl040(paddr);
            len -= PAGE_SIZE;
            paddr += PAGE_SIZE;
        }
        if (len > 0) {
            pushcl040(paddr);
            if (((paddr + len - 1) ^ paddr) & PAGE_MASK) {
                /* a page boundary gets crossed at the end */
                pushcl040(paddr + len - 1);
            }
        }
    }
#if 0
        /* on 68040, invalidate cache lines for pages in the range */
        while (len > PAGE_SIZE) {
            clear040(paddr);
            len -= PAGE_SIZE;
            paddr += PAGE_SIZE;
            }
        if (len > 0) {
            /* 0 < len <= PAGE_SIZE */
            clear040(paddr);
            if (((paddr + len - 1) / PAGE_SIZE) != (paddr / PAGE_SIZE)) {
                /* a page boundary gets crossed at the end */
                clear040(paddr + len - 1);
                }
            }
#endif
    else /* 68030 or 68020 */
        asm volatile ("movec %/cacr,%/d0\n\t"
                      "oriw %0,%/d0\n\t"
                      "movec %/d0,%/cacr"
                      : : "i" (FLUSH_I_AND_D)
                      : "d0");
}
 
 
/*
 * cache_push() semantics: Write back any dirty cache data in the given area,
 * and invalidate the range in the instruction cache. It needs not (but may)
 * invalidate those entries also in the data cache. The range is defined by a
 * _physical_ address.
 */
 
void cache_push (unsigned long paddr, int len)
{
    if (m68k_is040or060) {
        /*
         * on 68040 or 68060, push cache lines for pages in the range;
         * on the '040 this also invalidates the pushed lines, but not on
         * the '060!
         */
        while (len > PAGE_SIZE) {
            pushcli040(paddr);
            len -= PAGE_SIZE;
            paddr += PAGE_SIZE;
            }
        if (len > 0) {
            pushcli040(paddr);
#if 0
            if (((paddr + len - 1) / PAGE_SIZE) != (paddr / PAGE_SIZE)) {
#endif
            if (((paddr + len - 1) ^ paddr) & PAGE_MASK) {
                /* a page boundary gets crossed at the end */
                pushcli040(paddr + len - 1);
                }
            }
        }
 
 
    /*
     * 68030/68020 have no writeback cache. On the other hand,
     * cache_push is actually a superset of cache_clear (the lines
     * get written back and invalidated), so we should make sure
     * to perform the corresponding actions. After all, this is getting
     * called in places where we've just loaded code, or whatever, so
     * flushing the icache is appropriate; flushing the dcache shouldn't
     * be required.
     */
    else /* 68030 or 68020 */
        asm volatile ("movec %/cacr,%/d0\n\t"
                      "oriw %0,%/d0\n\t"
                      "movec %/d0,%/cacr"
                      : : "i" (FLUSH_I)
                      : "d0");
}
 
 
/*
 * cache_push_v() semantics: Write back any dirty cache data in the given
 * area, and invalidate those entries at least in the instruction cache. This
 * is intended to be used after data has been written that can be executed as
 * code later. The range is defined by a _user_mode_ _virtual_ address  (or,
 * more exactly, the space is defined by the %sfc/%dfc register.)
 */
 
void cache_push_v (unsigned long vaddr, int len)
{
    if (m68k_is040or060 == 4) {
        /* on 68040, push cache lines for pages in the range */
        while (len > PAGE_SIZE) {
            pushv040(vaddr);
            len -= PAGE_SIZE;
            vaddr += PAGE_SIZE;
            }
        if (len > 0) {
            pushv040(vaddr);
#if 0
            if (((vaddr + len - 1) / PAGE_SIZE) != (vaddr / PAGE_SIZE)) {
#endif
            if (((vaddr + len - 1) ^ vaddr) & PAGE_MASK) {
                /* a page boundary gets crossed at the end */
                pushv040(vaddr + len - 1);
                }
            }
        }
    else if (m68k_is040or060 == 6) {
        /* on 68040, push cache lines for pages in the range */
        while (len > PAGE_SIZE) {
            pushv060(vaddr);
            len -= PAGE_SIZE;
            vaddr += PAGE_SIZE;
        }
        if (len > 0) {
            pushv060(vaddr);
            if (((vaddr + len - 1) ^ vaddr) & PAGE_MASK) {
                /* a page boundary gets crossed at the end */
                pushv060(vaddr + len - 1);
            }
        }
    }
    /* 68030/68020 have no writeback cache; still need to clear icache. */
    else /* 68030 or 68020 */
        asm volatile ("movec %/cacr,%/d0\n\t"
                      "oriw %0,%/d0\n\t"
                      "movec %/d0,%/cacr"
                      : : "i" (FLUSH_I)
                      : "d0");
}
 
#undef clear040
#undef cleari040
#undef push040
#undef pushcl040
#undef pushcli040
#undef pushv040
#undef pushv060
 
unsigned long mm_phys_to_virt (unsigned long addr)
{
    return PTOV (addr);
}
 
int mm_end_of_chunk (unsigned long addr, int len)
{
        int i;
 
        for (i = 0; i < boot_info.num_memory; i++)
                if (boot_info.memory[i].addr + boot_info.memory[i].size
                    == addr + len)
                        return 1;
        return 0;
}
 
/* Map some physical address range into the kernel address space. The
 * code is copied and adapted from map_chunk().
 */
 
unsigned long kernel_map(unsigned long paddr, unsigned long size,
                         int nocacheflag, unsigned long *memavailp )
{
#define STEP_SIZE       (256*1024)
 
        static unsigned long vaddr = 0xe0000000; /* safe place */
        unsigned long physaddr, retaddr;
        pte_t *ktablep = NULL;
        pmd_t *kpointerp;
        pgd_t *page_dir;
        int pindex;   /* index into pointer table */
        int prot;
 
        /* Round down 'paddr' to 256 KB and adjust size */
        physaddr = paddr & ~(STEP_SIZE-1);
        size += paddr - physaddr;
        retaddr = vaddr + (paddr - physaddr);
        paddr = physaddr;
        /* Round up the size to 256 KB. It doesn't hurt if too much is
         * mapped... */
        size = (size + STEP_SIZE - 1) & ~(STEP_SIZE-1);
 
        if (m68k_is040or060) {
                prot = _PAGE_PRESENT | _PAGE_GLOBAL040;
                switch( nocacheflag ) {
                  case KERNELMAP_FULL_CACHING:
                        prot |= _PAGE_CACHE040;
                        break;
                  case KERNELMAP_NOCACHE_SER:
                  default:
                        prot |= _PAGE_NOCACHE_S;
                        break;
                  case KERNELMAP_NOCACHE_NONSER:
                        prot |= _PAGE_NOCACHE;
                        break;
                  case KERNELMAP_NO_COPYBACK:
                        prot |= _PAGE_CACHE040W;
                        /* prot |= 0; */
                        break;
                }
        } else
                prot = _PAGE_PRESENT |
                           ((nocacheflag == KERNELMAP_FULL_CACHING ||
                                 nocacheflag == KERNELMAP_NO_COPYBACK) ? 0 : _PAGE_NOCACHE030);
 
        page_dir = pgd_offset_k(vaddr);
        if (pgd_present(*page_dir)) {
                kpointerp = (pmd_t *)pgd_page(*page_dir);
                pindex = (vaddr >> 18) & 0x7f;
                if (pindex != 0 && m68k_is040or060) {
                        if (pmd_present(*kpointerp))
                                ktablep = (pte_t *)pmd_page(*kpointerp);
                        else {
                                ktablep = kernel_page_table (memavailp);
                                /* Make entries invalid */
                                memset( ktablep, 0, sizeof(long)*PTRS_PER_PTE);
                                pmd_set(kpointerp,ktablep);
                        }
                        ktablep += (pindex & 15)*64;
                }
        }
        else {
                /* we need a new pointer table */
                kpointerp = get_kpointer_table ();
                pgd_set(page_dir, (pmd_t *)kpointerp);
                memset( kpointerp, 0, PTRS_PER_PMD*sizeof(pmd_t));
                pindex = 0;
        }
 
        for (physaddr = paddr; physaddr < paddr + size; vaddr += STEP_SIZE) {
 
                if (pindex > 127) {
                        /* we need a new pointer table */
                        kpointerp = get_kpointer_table ();
                        pgd_set(pgd_offset_k(vaddr), (pmd_t *)kpointerp);
                        memset( kpointerp, 0, PTRS_PER_PMD*sizeof(pmd_t));
                        pindex = 0;
                }
 
                if (m68k_is040or060) {
                        int i;
                        unsigned long ktable;
 
                        /*
                         * 68040, use page tables pointed to by the
                         * kernel pointer table.
                         */
 
                        if ((pindex & 15) == 0) {
                                /* Need new page table every 4M on the '040 */
                                ktablep = kernel_page_table (memavailp);
                                /* Make entries invalid */
                                memset( ktablep, 0, sizeof(long)*PTRS_PER_PTE);
                        }
 
                        ktable = VTOP(ktablep);
 
                        /*
                         * initialize section of the page table mapping
                         * this 1M portion.
                         */
                        for (i = 0; i < 64; i++) {
                                pte_val(*ktablep++) = physaddr | prot;
                                physaddr += PAGE_SIZE;
                        }
 
                        /*
                         * make the kernel pointer table point to the
                         * kernel page table.
                         */
 
                        ((unsigned long *)kpointerp)[pindex++] = ktable | _PAGE_TABLE;
 
                } else {
                        /*
                         * 68030, use early termination page descriptors.
                         * Each one points to 64 pages (256K).
                         */
                        ((unsigned long *)kpointerp)[pindex++] = physaddr | prot;
                        physaddr += 64 * PAGE_SIZE;
                }
        }
 
        return( retaddr );
}
 
 
static inline void set_cmode_pte( pmd_t *pmd, unsigned long address,
                                  unsigned long size, unsigned cmode )
{       pte_t *pte;
        unsigned long end;
 
        if (pmd_none(*pmd))
                return;
 
        pte = pte_offset( pmd, address );
        address &= ~PMD_MASK;
        end = address + size;
        if (end >= PMD_SIZE)
                end = PMD_SIZE;
 
        for( ; address < end; pte++ ) {
                pte_val(*pte) = (pte_val(*pte) & ~_PAGE_NOCACHE) | cmode;
                address += PAGE_SIZE;
        }
}
 
 
static inline void set_cmode_pmd( pgd_t *dir, unsigned long address,
                                  unsigned long size, unsigned cmode )
{
        pmd_t *pmd;
        unsigned long end;
 
        if (pgd_none(*dir))
                return;
 
        pmd = pmd_offset( dir, address );
        address &= ~PGDIR_MASK;
        end = address + size;
        if (end > PGDIR_SIZE)
                end = PGDIR_SIZE;
 
        if ((pmd_val(*pmd) & _DESCTYPE_MASK) == _PAGE_PRESENT) {
                /* 68030 early termination descriptor */
                pmd_val(*pmd) = (pmd_val(*pmd) & ~_PAGE_NOCACHE) | cmode;
                return;
        }
        else {
                /* "normal" tables */
                for( ; address < end; pmd++ ) {
                        set_cmode_pte( pmd, address, end - address, cmode );
                        address = (address + PMD_SIZE) & PMD_MASK;
                }
        }
}
 
 
/*
 * Set new cache mode for some kernel address space.
 * The caller must push data for that range itself, if such data may already
 * be in the cache.
 */
 
void kernel_set_cachemode( unsigned long address, unsigned long size,
                                                   unsigned cmode )
{
        pgd_t *dir = pgd_offset_k( address );
        unsigned long end = address + size;
 
        if (m68k_is040or060) {
                switch( cmode ) {
                  case KERNELMAP_FULL_CACHING:
                        cmode = _PAGE_CACHE040;
                        break;
                  case KERNELMAP_NOCACHE_SER:
                  default:
                        cmode = _PAGE_NOCACHE_S;
                        break;
                  case KERNELMAP_NOCACHE_NONSER:
                        cmode = _PAGE_NOCACHE;
                        break;
                  case KERNELMAP_NO_COPYBACK:
                        cmode = _PAGE_CACHE040W;
                        break;
                }
        } else
                cmode = ((cmode == KERNELMAP_FULL_CACHING ||
                                  cmode == KERNELMAP_NO_COPYBACK)    ?
 
 
        for( ; address < end; dir++ ) {
                set_cmode_pmd( dir, address, end - address, cmode );
                address = (address + PGDIR_SIZE) & PGDIR_MASK;
        }
        flush_tlb_all();
}
 
 
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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [m68k/] [mm/] [memory.c] - Blame information for rev 1782

Line No.	Rev	Author	Line
1	1623	jcastillo	`/*`
2			`* linux/arch/m68k/mm/memory.c`
3			`*`
4			`* Copyright (C) 1995 Hamish Macdonald`
5			`*/`
6
7			`#include <linux/mm.h>`
8			`#include <linux/kernel.h>`
9			`#include <linux/string.h>`
10			`#include <linux/types.h>`
11			`#include <linux/malloc.h>`
12
13			`#include <asm/segment.h>`
14			`#include <asm/page.h>`
15			`#include <asm/pgtable.h>`
16			`#include <asm/system.h>`
17			`#include <asm/traps.h>`
18			`#include <asm/amigahw.h>`
19			`#include <asm/bootinfo.h>`
20
21			`extern pte_t kernel_page_table (unsigned long memavailp);`
22
23			/* Strings for `extern inline' functions in <asm/pgtable.h>. If put
24			`directly into these functions, they are output for every file that`
25			`includes pgtable.h */`
26
27			`const char PgtabStr_bad_pmd[] = "Bad pmd in pte_alloc: %08lx\n";`
28			`const char PgtabStr_bad_pgd[] = "Bad pgd in pmd_alloc: %08lx\n";`
29			`const char PgtabStr_bad_pmdk[] = "Bad pmd in pte_alloc_kernel: %08lx\n";`
30			`const char PgtabStr_bad_pgdk[] = "Bad pgd in pmd_alloc_kernel: %08lx\n";`
31
32			`static struct ptable_desc {`
33			`struct ptable_desc *prev;`
34			`struct ptable_desc *next;`
35			`unsigned long page;`
36			`unsigned char alloced;`
37			`} ptable_list = { &ptable_list, &ptable_list, 0, 0xff };`
38
39			`#define PD_NONEFREE(dp) ((dp)->alloced == 0xff)`
40			`#define PD_ALLFREE(dp) ((dp)->alloced == 0)`